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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc2be6f7b52dca1950d93afd7e19a7830cc200462bc9e6005005718780bc724' 
  AND token = 'BSz2KaAZX0gFdzPTNT0DlasY+wmrGAvSa6k6LPXelCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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