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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea6df4e72ea96c3dcc7344ad003e23d59ffee16564da868c7591ec093c94e0a' 
  AND token = 'vTX27CfWt8GntQ8XRe9ddVHDTMgTKJPelX395BNxoK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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