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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2f1b120e388718cc3c7dfbc5204f7bb7ac40e1ead87b7c5a36d87ef4cc43ab' 
  AND token = 'm8RY8Fb9lbKG1pCDr9gL/O4cpUXiO3LCIoq60Z1CAfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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