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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54570ea560fb6added1326b87c85e5980f8ad2ec5a4eeed861f9bb59c4816f6b' 
  AND token = 'GwoqEhySlkLoacnx3ypB9fq5waqqGijthGtDQ25jF10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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