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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ab7b9bc4a3c160631d915afa1b586dc5890be89d3cf3a7f35bb4ba8253af71' 
  AND token = '1Vbo2firzxCq20Nj9hg7wQ8xiXs+UXoeNHCTbreq2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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