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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d5971c7701edf4d63deb348498ef8ede2f9383b8cf2132d740a9a35db178e6' 
  AND token = 'xrNx+m/HY+T9PRicn4gu7WO/bAOyFiLHXEJNxm8sneg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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