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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeff50902ca7e8213511a6629f457f760f82e41d1ba99a32292ae64eca826b80' 
  AND token = 'b/GmwvezeeR7vP98eN8/bs1XvD7fZ87FE4Tkj5CWexc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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