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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63897a2cd9e46cc589b8185fc04cd950b695fa6ed34830730ca9ee9a1f0b5a78' 
  AND token = 'N+UxF3983KqIgUmeaDrTwBss9qVrrUspjAV1tP3D7/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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