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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbafe87e2d8a7f7b2708eef0991689becd32fb3dfde3e024e27b4c2f4d8824b' 
  AND token = 'A4/QEzSbY3vIYQj9xKznlHFoL+PdTbjY69dglni2k0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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