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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff7dec15a0312fcc29195f847d1dc9531bcb8b79b8452f80f12502bbc5e2fb5' 
  AND token = 'egpLWc8rxZw+imdEFMLS3bN2lB7n9O+BQ6kWCZir9zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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