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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97153f2c67d1f8695a4cc50c4decd7292f2c2662275fee9bc25e01b501ad916f' 
  AND token = 'rmtnffzy/PiJ3sY8WW25ZxluXLO7KcY3Vh36pKULtbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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