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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a23a27929188b10c97ed8ede2cab3391299652d08e5b3c47f1953992da630e' 
  AND token = 'pXVL5G035IrCh1L0U7w6LPhf5GTyzlQFPWJ9St2dvgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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