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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f92a809ef9a4bdf0995a865233d3f656b0265251e3d995b975fab04003f62d' 
  AND token = 'BMPem0Eucf/u4H4P0on7OL4cXhB9lB+Ishh0khwIigo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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