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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb3624b4647f0b1044a5b85d5e078e71e93371cd7448653496d44f1ea0cd80f' 
  AND token = 'Ql23S8PECmg52FAsQAiXkMloMrsjz8CVkuRiue9vAZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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