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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ace3bc41d8abf188dfe4610207bcd138940023bcf6317b6854155a0ec2a4fb' 
  AND token = '2Mv1SbfMl2v13l09C++ZFlA3KjqI84JggAwfLCBM9zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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