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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604be5777efacc01ed0fc403adf8557b4b74319c456057537291e667115e2583' 
  AND token = '5hNEYt1DFLWiNY7kH3J7tW8o/jqrIpcn157E/yjyimU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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