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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b28eddaf140189778f24e182cde6252e14721b625f86f57c87e8ded08272bf' 
  AND token = 'wxFDY33hktg3YCTId9d/Pt9dQ5f5ontLe7wiavJYh7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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