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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6da30a2c31dc4e39f5760cb01343073cafb63b7c9e8c248df689999777d4ed2' 
  AND token = 'McuK5gDDelPP9BK7laGyaP58XASk+1nwYCUL7iBCQQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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