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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec05861984363f35703d19d7d7a747dd5bccdd7e460c42f49880b3c488f6f756' 
  AND token = 'lD/OnasgM6UB04GFfnAa05IfLkTv1DRxcn40AIU0o/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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