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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d44c939497d89ef2f0a9487386e1d48a5668060db313e46b540fd4a74f82885' 
  AND token = 'NIMP7FB8NIw65oTu6uGrUdtU2pFbnpA3AJHQvQFg1aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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