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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb0234ec5da4b8407a9c70b5e1b27cbbb3f84ff2575dfb34d9f3b972da2f290' 
  AND token = 'EWawbK8jEhoEsOXIkeFBCEMY7StE7O44sNqpU8lxuAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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