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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70304eec59d2cf78c8c3e30105f2554c3daa228d243c8c3f046eb6143068f05' 
  AND token = 'bVrlLWx/4xqxYCyNnRyjx148vQcwbQ3JjVoPd7S/iUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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