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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a094b9790dba55588ac77ffc8fcdc35dde37a30994cc65f7e4bb21db2d0fb1c8' 
  AND token = 'J8zJh5dGTWgOEyzgfI0oCJz/pjkpcgY16V/SpcAeYYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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