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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1f64a0a0134fb7ee77811017adc14347458fcf625bc9d73262051dc3c5ae37' 
  AND token = 'J+Lxnk5K2gmQk2/xAvIX1M7W8rcW7cRoJEUfZZ3IJ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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