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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e2abdb35b3161e8241b4e6ff0f761494ee63a1421c853f0ebd08b14cb570c5' 
  AND token = 'FbErYvxlX6wbQAjcS8nUTIPeIKjfeoayED1DORF1r6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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