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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa47d3b524c1641b1f391eb1de04d4386d6b216c2d366b57620af93a9be01cc' 
  AND token = 'wdoPG+I8k3aNtJp1TQxHYJLB51sN1tXjdg49FVCBRiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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