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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3990ce20a93ab164cd21f615b3da59ac2c5ba57100cc21d74356f41a53992b' 
  AND token = 'BbahgrhDnHfoR9mlYWmEPFMY6/5kot3Tk5Fol91F+go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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