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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2243b5e9823cb2f29fee9e39a862609806a2baacb09f0bf1ebd5a2544cb95e' 
  AND token = 'Eh8GbhEXDG6QHieWQ/WzCQdEp8jXqCODqMoQmLuxvOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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