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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061f8b8a1c0b995375b28c3390338ec30d821068a6009e174106f8bc089a1f25' 
  AND token = 'MYZv669IowR1DOq09ZrVPzCTfgKLWNTBqgyayuB8BJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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