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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58379055e8304b798fd50e5aaff85468af6ee3d594cf9a8c9d4702d4c4474ab' 
  AND token = 'uwOonr4+O1WnM405vmlqR+O4VjTdzf8Vmsv4NCEILP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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