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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4240203ece054d93473b88cd1ab4c8fa0f999776f55f24e7095819af6a0d7b7' 
  AND token = 'EWp4ysXNFGz2w5UEoIKX+TRwLhczr8y0Ri3eN8APfmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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