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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c74a83ad69705ccee47284391f3a13fd727b795ae139fe0d9148e92f4a02f7' 
  AND token = '/g4TArP5r9ipe+ySyP9r1XrfpS5f7GUVeePTPz5OlB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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