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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ce9a1a58adf4449400768bf98101676363942536065ab55764fa23bd98b9df' 
  AND token = 'DyT933cVYGjHSrvI0qQJ2x8oAD4MrrqHCHB8jRChoLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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