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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfab396f078fbcaf670d60be049172f7ff72413b6b0ed0852becab0c474931b' 
  AND token = 'XNCiEPoFHt4RPgLVxKTkLlH9M/KMCPvzfGZHi8en8rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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