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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7709deeedd49ac59a1984705265b0045246cbd31da37f3c2295a702bb0a3d0d0' 
  AND token = '/o2qW+dtNGMPzVg1R3GzoPMoFIqejDGIWErPZUmqL24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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