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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc3a40829e453fe34e0e22ec9382c3088c72347ebabc364fe0a36d4cdb319bb' 
  AND token = 'ufi9Ib/OBk+Cd1O/ZV2Sb7USfj+hJwDvOcEsWrgipO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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