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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afd63603cee8ac0039096f8a120711e975f62f8a59be7dffa867655c7ffe48e' 
  AND token = 'TSI4MZp7flxn2LVhI/oeDKZXFrUfkclLXLIMixrzzKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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