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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f295ee0c73d1d3b82dc16a734fb7172aa9bc26954975255b63f3135934dc56' 
  AND token = 'zukHHxGAh9U81a9FuP5Nj7Y3e9D+mNZK817rCGLCk5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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