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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64195dba3a48ffbaed3ca7e4c1aa9f4004c3bfd92e74e14f1dc112e130ec69f9' 
  AND token = 'aUSxN5w6JwmpjsizH0dMtt/sEjXcnXXOBwzi3cyZhg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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