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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92522b203f39eb2282b7ad6708a34658ccfc775af165c43b3935e95f403de64' 
  AND token = 'KD5yn/sNw5cJDij9UqIIymzxoM22tsGj8FmLcXRiwvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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