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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ec6e8bfa03d736571994ad67c8bbce826ea737ebc90084ed42cc6bba5baa7e' 
  AND token = '25VrZRLu8sYX3FwCSAGKR/ogE9FRzocm8Xc48OXTtLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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