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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb86d5b54fd3059c396a106a0726196bded52fda1ba6811cf3346c7720132c8b' 
  AND token = 'ax1BOngOPVRPJsHrt4OPkjQwlvvrAdrXQ4OPOR02w4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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