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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2a6616745459e03bfb6f186a56a24f1c2f8d6911e65dcea578f5e370adab52' 
  AND token = '5/1/ag7+D3roCQ2BjT5EGUuABm5QzoWKa/Jnbm8TFlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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