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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df016a8eb3e15f4af1047bd307917fe7f311eca32714d5b93d4d522b39a1045' 
  AND token = 'nF6dWhkWGLwCnCq6VIImBdxaXMtw57MkHMUm+D0KsiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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