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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c48d73f3e13d55ce759bc2ccdd8d4e4b20c1b8b1739968efaca26441866dd4e' 
  AND token = 'VLXri8NP+BKmXGrdBd4asy9nyj77Vspfl9YlnaHcx0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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