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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab256750bdabbd575abbf47a5e24ecfe2bd1d8dcba6be631c4dc436d4c5814ac' 
  AND token = '5yMS6BOVKNouYXfCIQOTUyf/cXmEuMY4V/DgXVOsfYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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