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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170d915c083d7de63dc113dbb72d2477e50b9e7a46d635561fea5f48bfd99d90' 
  AND token = 'a3Ix+2KxtOkQ82AhxxiD0Sf3zJj3s9BvSdhW/idmEE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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