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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6cc5cfe5ad2a19d1e89442c253404a418282f2b33d6673795c6bd97e1d8190' 
  AND token = 'aUVYvCV78IbSp/AZyZEMR1Closlk31XO+1DSlrAAgvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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