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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4caf2248ad00b22419b0e4ba11d3f14593fea473aa1d71f126316493f7206b' 
  AND token = 'nx2pYkteVT4J3zyMIjbis6R5RVyeH+thPbyGC+Gksgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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