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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73871e2f09fb7ccc5c288994dd95dd0ffeecec4d1d86f7e53fe1159a3351d1ac' 
  AND token = 'Pc9b7EPbNsg4sgE6i9a6Wn4ejcNEreJtKrDJI04Fz3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}