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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d06f89a2c2fb243afdc402b8730120315205da970d2c58112795be2bca18a5' 
  AND token = '/+uhpq7jD+nG0O0D03gnrbL4FuLbgVyhKqug//OY0S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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