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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9530d77defb12bcba22e1bb782bd93b5f932cf10f011293f6b4b3c5f7a9581' 
  AND token = 'Rrs6XCYXUmDFuGyeOKji/mPTNgnkq8FqrSfMGkgkMX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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