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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0a91d12dc5dc841b33de5e4f8cf50e23b44a8954923cd41ddd4cd780dcd694' 
  AND token = 'GIqhm3IprOuVXbSBtzPGseTnDCZbL/Ep9MdZaStkaz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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