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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7dc41335dd7d6a43a0c3cb043a9a2367605808a5614ca9dcfd1f383b4bf2cd' 
  AND token = 'UWMPEqzJbBw3pXa4/RIDPDGKgfqVA2BQ4hrktpe0t4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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