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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47ff56fb50cba6ae87ca400d260aba72970b5df9c8090ef52555b33d2322074' 
  AND token = 'JjRqzgjManMx6FFqJeJqUM6z8OnR3L6v2BoaAbwH2pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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