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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71342569399555a28d591f6c35f00ee60ea3c2a74e575972a76bf54ca59c5b68' 
  AND token = 'BRMt03p0vcpo7Apei+qDpdrnKpTDl3KcqHaKyk67I2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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