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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee3a5f5f9e6c7dc90f5037317ac1bc69cfe6aa94b72842ebc6bae450ca9c67d' 
  AND token = 'Pv8lkzYzEVhBRLqLTEhaAuSl2mqCu7cIHZoOKntdAPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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